[getting started] input n integers and output the smallest K of them

describe

Input n It's an integer , Find out the smallest k An integer and output in ascending order

Input description

Enter two integers on the first line n and k
On the second line, enter an array of integers

Output description

From small to large, output the smallest k It's an integer , Separate with spaces .

Example 1

Input ：5 2
1 3 5 7 2
Output ：1 2

<?php
$num = fgets(STDIN);
$data = fgets(STDIN);

//  Total array length   and   You need to intercept the length of the array 
$num_arr = explode(' ',trim($num,"\t\n\r"));
//  Intercept the required length 
$data_arr = array_slice(explode(' ',trim($data,"\t\n\r")),0,$num_arr[0]);
//  Sort   From small to large 
sort($data_arr);
//  Intercept the required array 
$res_arr = array_slice($data_arr,0,$num_arr[1]);
echo implode(" ",$res_arr);